Re: [PATCH 1/5] cpuset memory spread basic implementation

[Christoph Lameter]

On Tue, 7 Feb 2006, Andi Kleen wrote:

> > The opterons are some strange mix of SMP and NUMA system. The NUMA "nodes" 
> > are on the same motherboard 
> 
> Actually it's not true - 8 socket systems are built out of two
> boards. And there are much bigger systems upcomming.

But they are still next to one another.... No distance to cover,.
> 
> > and therefore there are only small latencies  
> > involved. NUMA only gives small benefits.
> 
> That's also not true. Everytime I get memory placement for 
> process memory wrong users complain _very_ loudly and there 
> are clear benefits in benchmarks too.

What are the latencies in an 8 way opteron system? I.e. Local memory, next 
processor, most distant processor?


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